INCOME TAXES - Provision for income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 3,960	$ 202	$ 11,902
State	415	321	1,428
Foreign	1,025	1,798	1,584
Current income tax expense	5,400	2,321	14,914
Deferred:
Federal	(238)	1,095	245
State	(28)	122	27
Foreign	41	(7)	(66)
Deferred income tax expense	(225)	1,210	206
Income tax expense	$ 5,175	$ 3,531	$ 15,120